Dust-guard.



N0. 808,550. PATENTED DEC. 26, 15905. O. M. LAURITZEN & W. M. (300K.

DUST GUARD.

APPLICATION FILED FEB.15.1905.

2 SHEBTSSHEET 1.-

142722551965: 6 Jmaenfar: r 'I 25W n Zm a/w 7% $32 No 808,550. PATENTED DEC. 26, 1905. G. M. LAURITZEN & W. M. COOK.

2 SHEETS-SHEET 2.

DUST GUARD.

APPLICATION FILED PEB15,1905.

UNITED STATES PATENT EETEE.

CHRISTIAN MARIUS LAURITZEN AND WALTER M. COOK, OF CHICAGO, ILLINOIS.

DUST-GUARD.

Specification of Letters Patent.

Patented Dec. 26, 1905.

To all whom it may concern:

Be it known that we, CHRISTI N MARIUs LAURITZEN and WALTER M. Cook, citizens of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Dust-Guards, of which the following is a specification.

Our invention relates to improvements in dust-guards that may be used in connection with any machinery, but is especially intended for use on the roller-shafts of crushingmills.

The object of our invention is to provide a dust-guard that will prevent finely-pulverized matter from working into the journal-box.

A further object is to provide a simple and inexpensive dust-guard that may be readily assembled in place and one that may be used effectively for a long period Without renewing any of the parts.

A further object is to provide a dust-guard the parts of which that are subjected to wear may be renewed without disturbing the remainder of the structure.

These and such other objects as may here. after appear are attained by the devices illustrated in the accompanying drawings, in

which Figure 1 represents a side elevation, partly in section, of our improved dust-guard. Fig. 2 is a cross-section on the line 2 2 of Fig. 1 looking in the direction indicated by the arrows. Fig. 3 is a transverse section on the line 3 3 of Fig. 2 looking in the direction indicated by the arrows. Fig. 4 is a perspec tive view of the dust-guard with plates and blocks removed, and Fig. 5 is a modified form of block.

Like letters of reference indicate like parts in the several figures of. the drawings.

A represents a shaft upon which is secured a bushing B, which serves to take up any wear and prevent wearing of the shaft. The shaft passes through a central bore in the casting or casing C, provided with a plurality of recesses D, extending therethrough, the recesses in adjacent sides being in staggered relation to each other. The casting C terminates in a circular boss C. Fitting in the above-namedrecesses areblocksE,preferably of wood. These blocks are arranged in pairs upon opposite sides of the bushing, and the faces which embrace the bushing are substantially semicircular and ,are yieldingly held in place by means of springs G. These blocks are so constructed that their ends f do not quite meet, leaving a space to accommodate the wear of the blocks. Bolted to the four faces of the casting C are plates J. Each plate is preferably provided with a lug K. The springs G are mounted in recesses L, ex-

tending through the plates into the lugs K.

M is a fiange by means of which the dustguard can be secured in place in certain desired constructions.

When the dust guard is assembled, the faces of the blocks are preferably lubricated and the blocks slipped in place. No further lubrication will be necessary when the shaft is used vertically, as additional oil will trickle down from the other bearings to keep the bearing Well lubricated. When the shaft is horizontal, extra lubrication may be provided by any well-known means. The springs are placed in the recesses in the plates and lugs and the plates secured in place, the free ends of the springs resting on the ends of the blocks, pressing them yieldinglv against the bushmg.

The placing of the blocks in staggered rela tion serves to prevent any dust or foreign matter from working into the bearing, as there is no open channel of communication, and as the blocks become worn the small openings between the ends gradually diminish, and thus serve to render the bearing more perfectly dustproof.

This construction is very simple and ineX- pensive, there are no complicated parts to get out of order, and when the dust-guard is in an exposed position the plates can often be readily removed and new blocks substituted for those worn without stopping the machinery. This construction may also be used regardless of whether the motion of the shaft be rotary or reciprocal.

The form described serves all ordinary purposes desired; but if it is desired to pack the bearing against fluid-pressure the structure shown may be supplemented by recesses 0 in the blocks E, as shown in Fig. 5, and rubber or any other suitable packing may be mounted in said recesses. So, also, while we have illustrated the plates as being provided with lugs within which the springs are mounted it is'possible to dispense with the lugs and seat the springs in shallower recesses in the plates themselves.

We claim 1. In an article of the class described, an integral casing having a central bore and a plurality of recesses opening on said bore,

said recesses in adjacent facesbeing in staggered relation to each other, and a plurality of blocks mounted Within said recesses.

2. In an article of the class described, an integral casing having a central bore and a plurality of recesses extending through said casing, said recesses in adjacent faces being in staggered relation to each other, and a plurality of blocks mounted Within saidrecesses.

3. In an article of the class described, an integral casing having a plurality of recesses in the faces thereof, blocks mounted Within said recesses adapted to surround a central bore, plates secured to the faces of said casing, there being recesses in the inner faces of said plates and springs seated in said recesses adapted to yieldingly hold said blocks in place.

4. In an article of the class described, an integral casing having a plurality of recesses in the faces thereof, blocks mounted Within said recesses and adapted to surround a central bore, plates provided with lugs secured to the faces of said casing, there being recesses in the inner faces of said plates and extending into said lugs and springs seated therein adapted to yieldingly hold said blocks in place.

5. Adust-guard comprising a casing adapted to surround a shaft and provided With a series of recesses arranged in staggered relation to each other, blocks mounted Within said recesses and arranged to substantially surround such shaft, plates secured to the faces of the casing, and springs fitted Within recesses in said plates and yieldingly holding said blocks in place.

CHRISTIAN MARIUS LAURITZEN. WALTER llI. 000K.

Witnesses as to signature of Christian Marius Lauritzen:

G. Y. DANKWARD, F. H. DRURY.

Witnesses as to signature of Walter M. Cook:

A. S. PRATT, WM. H. MINS. 

